Boiler construction.



A. B. STIRLING. BOILER CONSTRUCTION.

APPLICATION FILED DBO. 13. 1909.

Patented Nov. 29, 1910..

WITNESSES: INVENTOR HH'. g m.

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A. B. STIRLING.

BOILER CONSTRUCTION. I APPLICATION FILED DEO,18, 1909.

Patented Nov. 29, 1910.

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WITNESSES:

THE NORRIS PETERS c --.WASHINGTUN, n. c,

UNITED STATES PATEN FFICE.

ALISON B. STIRLING, 0F PLEASANT MOUNT, PENNSYLVANIA.

BOILER CONSTRUCTION.

as will enable others skilled in the art to I which it appert-ains to make and use the same.

This invention relates to improvements in boiler construction and with regard to the more specific features thereof to boilers of the water-tube type.

One of the objects of the invention is to provide a practical boiler which will have a high heating etliciency combined with ease of cleaning.

Another object is to provide a boiler of this type in which the circulating water will have a definite and positive circulation and whereby the coolest gases will be directed against the tubes containing the coolest water.

A still further object is to provide simple and efficient protective means for the exposed parts of the boiler against the direct fiow'of the furnace gases.

The invention accordingly consists in the features of construction, combinations of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings wherein is illustrated one of various possible embodiments of my invention, Figure 1 is a longitudinal section of the boiler taken on line 0cm of Fig. 2; in Fig. 2 the portion to the left of the center line is a cross-section on line g g of Fig. 1, and the portion to the right of the center line is a section on line za of Fig. 1; Fig. 3 is a partial cross section showing a modified form of certain parts of my invention.

Similar reference characters refer to similar parts in all views of the drawings.

Referring now to the drawings, 1 indicates the foundation or base which supports the furnace and the boiler setting 2.

The fire-box is represented at 8, the upper wall of said fire-box being formed by an arch 4, in which is formed an aperture 5,

Specification of Letters Patent.

Application filed December 18, 1909.

Patented Nov. 29, 1910.

Serial No. 533,932.

which may, if desired, be connected with the ash pit. This aperture, in the present instance, is adapted to be closed by a plate 6, although any suitable means may be employed in this relation.

A stack 7 leads from. the setting of the boiler near the lower portion thereof above the fire-box.

At this point it may be noted that while, in the present instance, two fire-boxes having independent stacks are employed, which stacks may, if desired, be connected with a common flue or chimney, these portions of the construction are similar in all respects, and a description of one side of the boiler, therefore, will suffice to impart a clear understanding of the invention.

Stack 7 is provided with an aperture 8 adapted to be closed by door 9, and the front wall 10 of the setting of the boiler is likewise provided with an aperture 11 similarly adapted to be closed by a door 12. The object of these apertures 8 and 11 is to permit a scraper or other instrument to be inserted in the flue and in the space above the arch 4, and manipulated to discharge accumulations of dust and ashes from upon the upper portion of the arch and from the stack.

In the central portion of the boiler is a longitudinally extending water drum 13 from which leads a plurality of substantially vertically disposed tubes 14, the upper ends of said tubes leading into a steam and water-drum 15 which extends longitudinally of the boiler near the upper portion. A pair of baffles 16 and 17 extend upwardly between tubes 14, and a baffle 18 extends downwardly between tubes 14 and is interposed between baffles 16 and 17. Baffie 17 is provided with an aperture 41 arranged in longitudinal alinement with the aperture 11 in wall 10.

It will be observed that the arrangement of the baflies with respect to the tubes of the boiler provides channels so that the heated gases will pass progressively from the furnace through the spaces occupied by these tubes before the same are discharged from water flowing into the compartment 28, through a feed connection 29, located near the upper part of the water-drum 13, to flow in an upward direction through the series of water-tubes. The partition 26 as shown is removably secured to an angle iron 42 fastened to the shell of drum 13. A second angle 43 is fastened to the shell at another point, in the present case,'in line with baffle 18. If desired, the position of the partition may be changed by detaching from angle 42 and securing to angle 43. It will be observed that the water circulates through the tubes 14 of the boiler, in a direction opposite to that traveled by the heated gases from. the furnace, and that the battles are disposed in such manner that the coolest gases are brought into contact with the tubes containing the coolest water.

Blow-off pipe 34: leads from the compartment 28, of the water-drum 13, and, if desired, partition 26 may be provided with an aperture in its lower portion so that the entire drum may be blown off through said blow-off pipe 34: or through the transversely extending drum 35 which is connected to the water-drum 13 by a pipe connection 36 in a position substantially beneath the rearward end of the arch 4. A wall 37 is supported upon said drum 35 and extends upwardly into contact with the end of said arch and beyond said arch to form the baflie '16. This drum is provided with a blow-ofl pipe 38. Circulating tubes 39 extend rearwardly from said transverse drum 35 and are con nected to the water-drum 13 adjacent to the rear end thereof. Supported upon said tubes is a baffle 40 composed of refractory tiles. These tubes and baffle being located substantially beneath the water-drum effectually prevent the latter from being injured by the direct flow of the furnace gases. Furthermore, the arrangement of the transverse drum 35 protects the wall 37 and the arch 4 from injury due to the excessive heat at this point. In Fig. 3 there is shown a modification of this feature of applicants invention, wherein the water-tubes 39 are led rearwardly through the rear wall of the boiler and connected into the rear head of the water-drum 13.

In operation, it will be seen that the gases from the furnace pass beneath the transverse-drum 35 and upwardly around the circulating tubes 39 on their way to the tubes 14% of the boiler. At this point a very active circulation of the water is caused which flows downwardly through the pipe connection 36, passes through the transverse drum 35 and upwardly through the circulating tubes 39 back to the water drum. It will be seen that said gases while surround ing the vertical tubes 14 will first pass upward between bafile 16 and the rear of the boiler setting, then downward between baflies 16 and 18, then upward between baffles 18 and 17 and finally downward be tween baflie 17 and the front of the boiler setting to the stack 7 and as the water within the boiler is circulating through the tubes in an opposite direction to that of the gases, it, of course, follows that the coolest gases will be in contact with the tubes containing the coolest water.

It will accordingly be seen that I have provided a construction well adapted to attain, among others, all the ends and objects above pointed out in a simple, yet eflicient manner. By reason of the fact that the coolest gases are always in contact with tubes containing the coolest water, there is provided an economical and thorough abstraction of the heat carried by said gases. It will further be seen that by providing a transverse drum located beneath the wall 37 and by connecting it to the water-drum near the rear end of the same, said wall, water-drum and arch are effectively protected from the effects of the high temperature obtaining in this region.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all mat ter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a steam boiler, in combination, a fire-box, a water-drum, a transversely ex tending drum, a wall supported by said transverse drum and extending up to and around said water-drum, an arch extending beneath said water drum rcarwardly to said wall, and water evaporating tubes connecting said drums.

2. In a steam boiler, in combination, a fire-box, a water-drum, a transversely extending drum disposed beneath the rear portion of said water drum, means connecting said drums, tubes extending from said transverse drum rearwardly and upwardly to said water-drum, and a baffie supported by said tubes. 1

3. In a water tube boiler, in combination, a fire-box, a water-drum, a transversely extending drum, means connecting said drums, tubes further connecting said drums and positioned substantially beneath the rear portion of said water-drum, and a baifle supported by said tubes adapted to protect said drum from the direct flow of the furnace gases.

4. In a water tube boiler, in combination, a fire-box, a water-drum, a transversely extending drum located beneath said waterdrum and connected therewith, and watertubes extending rearwardly from said transverse drum and connected to said water drum.

5. In a steam boiler, in combination, a fire-box, a longitudinal water-drum, a transverse drum positioned beneath the rear portion of said water-drum, a steam and water drum, water tubes extending upwardly from said water-drum to said steam and water drum, water tubes extending from said transverse drum rearwardly to said water-drum, and a wall supported upon said transverse drum and projecting upwardly among said first set of tubes.

6. In a steam boiler, in combination, a fire-box, a longitudinal water-drum, a transverse drum positioned beneath the rear portion of said water-drum, a steam and water drum, water tubes extending from said water-drum to said steam and water drum, water tubes extending from said transverse drum rearwardly to said water-drum, a wall supported upon said transverse drum and projecting upwardly among said first set of tubes, and an arch extending over said fire-box rearwardly to said wall.

7. In a steam boiler, in combination, two fire-boxes, each provided with an arch extending rearwardly from the front boiler wall, a longitudinal water-drum positioned above and between said arches, a transverse drum positioned substantially beneath the rear end of said arches, a wall supported by said last drum and rising to meet said arches, and water connections between said drums.

8. In a steam boiler, in combination, two distinct fire boxes, each provided with an arch extending rearwardly from the front boiler wall, a longitudinal water-drum positioned above and between said arches, a transverse drum positioned substantially beneatli the rear end of said arches, a wall supported by said last drum and rising to meet said arches, means embedded in said wall adapted to connect said drums, and circulating tubes connecting said drums and located rearwardly of said wall.

9. In a steam boiler, in combination, a fire-box having a rearwardly extending arch, a water-drum provided with a plurality of groups of upwardly reaching tubes, a steam and water drum connecting the upper ends of said tubes, a plurality of vertically disposed baffles partially separating said groups of tubes, one of said bafiies extending to a point substantially beneath the end of said arch, a transverse drum positioned beneath said battle last mentioned and adapted to support the same, and water circulating means connecting said water-drum and said transverse drum, the whole being formed and adapted to conduct the products of combustion rearwardly beneath said arch and transverse drum, upwardly behind saidlastmentioned baffle and forwardly among said vertical water tubes, said plurality of baffies being arranged to give to said gases a sinuous path of travel.

10. In a steam boiler, in combination, a furnace, a water-drum, a steam and water drum disposed above the water-drum, vertically disposed tubes interposed between said drums, a plurality of baffles extending upwardly from said furnace and interposed between said tubes, a baflle extending downwardly between said tubes and said first mentioned baffles, a partition arranged with in said water-drum at a point adjacent to one of said first mentioned battles, and a feed connection leading to the upper portion of said water-drum forwardly of said partition.

11. In a steam boiler, in combination, a furnace, a water-drum, a partition dividing the same into front and rear compartments, a feed connection leading into said front compartments near the top thereof, a steam and water drum disposed above said waterdrum, vertically disposed tubes connecting said drums, a plurality of battles extending upwardly from the furnace between said tubes, one of said baffles being disposed immediately above said partition, a battle extending downwardly between said tubes and between said first mentioned baflies, and a flue leading from said furnace.

12. In a steam boiler, in combination, a water-drum, a plurality of annular flanges secured within said drum and a partition adapted to be secured to any one of said flanges.

13. In a steam boiler, in combination, a water-drum, a steam and water drum disposed above the water-drum, vertically disposed tubes connecting said drums, a plurality of batfles interposed between said tubes and dividing them into groups, a plurality of angle irons secured within said waterdrum in alinement with said battles and a partition adapted to be secured to any one of said angle irons.

14. In a steam boiler, in combination, a fire-box, a water-drum, a partition dividing said water-drum into front and rear chambers, a transversely extending drum connected to said rear chamber and a feed water connection to said front chamber.

15. In a steam boiler, in combination, a firebox, a water-drum, a partition dividing sa1d water-drum into front and rear chambers, a. steam and Water drum, tubes connecting the latter with said front chamber,

I tubes connecting thesame to said rear chamher, a feed Water connection to said front 5 chamber, and an underlying transversely extending drum connected to said rear chamber.

In testimony whereof I affix my signature, 1n the presence of two Witnesses.

ALISON B. STIRLING.

WVitnesses ALLAN STIRLING, C. H. GARDNER. 

